| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/value-bag-1.4.0/src/fill.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fill.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../value_bag/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../value_bag/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Deferred value initialization. |
| //! |
| //! The [`Fill`] trait is a way to bridge APIs that may not be directly |
| //! compatible with other constructor methods. |
| //! |
| //! The `Fill` trait is automatically implemented for closures, so can usually |
| //! be used in libraries that can't implement the trait themselves. |
| //! |
| //! ``` |
| //! use value_bag::{ValueBag, fill::Slot}; |
| //! |
| //! let value = ValueBag::from_fill(&|slot: Slot| { |
| //! #[derive(Debug)] |
| //! struct MyShortLivedValue; |
| //! |
| //! slot.fill_debug(&MyShortLivedValue) |
| //! }); |
| //! |
| //! assert_eq!("MyShortLivedValue", format!("{:?}", value)); |
| //! ``` |
| //! |
| //! The trait can also be implemented manually: |
| //! |
| //! ``` |
| //! # use std::fmt::Debug; |
| //! use value_bag::{ValueBag, Error, fill::{Slot, Fill}}; |
| //! |
| //! struct FillDebug; |
| //! |
| //! impl Fill for FillDebug { |
| //! fn fill(&self, slot: Slot) -> Result<(), Error> { |
| //! slot.fill_debug(&42i64 as &dyn Debug) |
| //! } |
| //! } |
| //! |
| //! let value = ValueBag::from_fill(&FillDebug); |
| //! |
| //! assert_eq!(None, value.to_i64()); |
| //! ``` |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::std::fmt; |
| |
| <span class="kw">use </span><span class="kw">super</span>::internal::InternalVisitor; |
| <span class="kw">use super</span>::{Error, ValueBag}; |
| |
| <span class="doccomment">/// A type that requires extra work to convert into a [`ValueBag`](../struct.ValueBag.html). |
| /// |
| /// This trait is an advanced initialization API. |
| /// It's intended for erased values coming from other logging frameworks that may need |
| /// to perform extra work to determine the concrete type to use. |
| </span><span class="kw">pub trait </span>Fill { |
| <span class="doccomment">/// Fill a value. |
| </span><span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error>; |
| } |
| |
| <span class="kw">impl</span><F> Fill <span class="kw">for </span>F |
| <span class="kw">where |
| </span>F: Fn(Slot) -> <span class="prelude-ty">Result</span><(), Error>, |
| { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| (<span class="self">self</span>)(slot) |
| } |
| } |
| |
| <span class="doccomment">/// A value slot to fill using the [`Fill`](trait.Fill.html) trait. |
| </span><span class="kw">pub struct </span>Slot<<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> { |
| visitor: <span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span><span class="kw">dyn </span>InternalVisitor<<span class="lifetime">'f</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> fmt::Debug <span class="kw">for </span>Slot<<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| f.debug_struct(<span class="string">"Slot"</span>).finish() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> Slot<<span class="lifetime">'s</span>, <span class="lifetime">'f</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(visitor: <span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span><span class="kw">dyn </span>InternalVisitor<<span class="lifetime">'f</span>>) -> <span class="self">Self </span>{ |
| Slot { visitor } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>fill<F>(<span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><(), Error> |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span><span class="kw">dyn </span>InternalVisitor<<span class="lifetime">'f</span>>) -> <span class="prelude-ty">Result</span><(), Error>, |
| { |
| f(<span class="self">self</span>.visitor) |
| } |
| |
| <span class="doccomment">/// Fill the slot with a value. |
| /// |
| /// The given value doesn't need to satisfy any particular lifetime constraints. |
| </span><span class="kw">pub fn </span>fill_any<T>(<span class="self">self</span>, value: T) -> <span class="prelude-ty">Result</span><(), Error> |
| <span class="kw">where |
| </span>T: Into<ValueBag<<span class="lifetime">'f</span>>>, |
| { |
| <span class="self">self</span>.fill(|visitor| value.into().inner.internal_visit(visitor)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"wasm32"</span>)] |
| </span><span class="kw">use </span>wasm_bindgen_test::<span class="kw-2">*</span>; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::std::string::ToString; |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_value_borrowed() { |
| <span class="kw">struct </span>TestFill; |
| |
| <span class="kw">impl </span>Fill <span class="kw">for </span>TestFill { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">let </span>dbg: <span class="kw-2">&</span><span class="kw">dyn </span>fmt::Debug = <span class="kw-2">&</span><span class="number">1</span>; |
| |
| slot.fill_debug(<span class="kw-2">&</span>dbg) |
| } |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="string">"1"</span>, ValueBag::from_fill(<span class="kw-2">&</span>TestFill).to_string()); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_value_owned() { |
| <span class="kw">struct </span>TestFill; |
| |
| <span class="kw">impl </span>Fill <span class="kw">for </span>TestFill { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| slot.fill_any(<span class="string">"a string"</span>) |
| } |
| } |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_cast() { |
| <span class="kw">struct </span>TestFill; |
| |
| <span class="kw">impl </span>Fill <span class="kw">for </span>TestFill { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| slot.fill_any(<span class="string">"a string"</span>) |
| } |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| <span class="string">"a string"</span>, |
| ValueBag::from_fill(<span class="kw-2">&</span>TestFill) |
| .to_borrowed_str() |
| .expect(<span class="string">"invalid value"</span>) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_debug() { |
| <span class="kw">struct </span>TestFill; |
| |
| <span class="kw">impl </span>Fill <span class="kw">for </span>TestFill { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| slot.fill_any(<span class="number">42u64</span>) |
| } |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">format!</span>(<span class="string">"{:04?}"</span>, <span class="number">42u64</span>), |
| <span class="macro">format!</span>(<span class="string">"{:04?}"</span>, ValueBag::from_fill(<span class="kw-2">&</span>TestFill)), |
| ) |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_fn_cast() { |
| <span class="macro">assert_eq!</span>( |
| <span class="number">42u64</span>, |
| ValueBag::from_fill(<span class="kw-2">&</span>|slot: Slot| slot.fill_any(<span class="number">42u64</span>)) |
| .to_u64() |
| .unwrap() |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(target_arch = <span class="string">"wasm32"</span>, wasm_bindgen_test)] |
| </span><span class="kw">fn </span>fill_fn_borrowed() { |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>MyValue; |
| |
| <span class="kw">let </span>value = MyValue; |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">format!</span>(<span class="string">"{:?}"</span>, value), |
| <span class="macro">format!</span>( |
| <span class="string">"{:?}"</span>, |
| ValueBag::from_fill(<span class="kw-2">&</span>|slot: Slot| slot.fill_debug(<span class="kw-2">&</span>value)) |
| ) |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="value_bag" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
